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[Lapack] code for non-linear least square fit

Hi,

I could not figure out any open source code in Fortran to do a
non-linear least square code. Hence I wrote one of my own to do it
(using Levenberg-Marquardt method).

I would be proud if it is any use to LAPACK. I have attached the codes.
It is decently commented. I can of-course modify it according to the
needs of the LAPACK programming style.

Regards,
Amber Jain
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